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消防用电设备的配电线路，当采用穿金属管保护，暗敷在非燃烧体结构内时，其保护层厚度不应小于______。
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在多层和高层主体建筑物的底层布置装有可燃性油的电气设备时，其底层外墙开口部位的上方应设置防火挑檐的宽度不小于多少______
某20层办公建筑，总建筑面积为12万m2，东西长200m，南北宽30m。每层设3个防火分区，每个防火分区贯通南北向。在建筑物的中部设有10kV配电所、10/0.4kV变电所和弱电控制中心、综合布线主设备间，在东部和西部各设有一个10/0.4kV变电所和综合布线分设备间，该建筑物配置完善的智能化系统。 电气间在每层楼应设维护检修门，其耐火等级不应低于三级，门可开向______。
第三类防雷建筑物的防直击雷措施中，应在屋顶设接闪网，接闪网的尺寸不应大于______。
Take the case of public education alone. The principal difficulty faced by the schools has been the tremendous increase in the number of pupils. This has been caused by the advance of the legal age for going into industry and the impossibility of finding a job even when the legal age has been reached. In view of the technological improvements in the last few years, business will require in the future proportionately fewer workers than ever before. The result will be still further raising of the legal age for going into employment, and still further difficulty in finding employment when that age has been attained. If we cannot put our children to work, we must put them in school. We may also be quite confident that the present trend toward a shorter day and a shorter week will be maintained. We have developed and shall continue to have a new leisure class. Already the public agencies for adult education are swamped by the tide that has swept over them since the depression began. They will be little better off when it is over. Their support must come from the taxpayer. It is surely too much to hope that these increases in the cost of public education can be borne by the local communities. They cannot care for the present restricted and inadequate system. The local communities have failed in their efforts to cope with unemployment. They cannot expect to cope with public education on the scale on which we must attempt it. The answer to the problem of unemployment has been Federal relief. The answer to the problem of public education may have to be much the same, and properly so. If there is one thing in which the citizens of all parts of the country have an interest, it is in the decent education of the citizens of all parts of the country. Our income tax now goes in part to keep our neighbors alive. It may have to go in part as well to make our neighbors intelligent. We are now attempting to preserve the present generation through Federal relief of the destitute (贫民). Only a people determined to ruin the next generation will refuse such Federal funds as public education may require. (378 words) The public agencies for adult education will be little better off because______.
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